泥岩变形特性与能量特征的试验研究

由于软岩组成的复杂性和工程的严重危害性,使其成为岩土工程领域最为复杂的前沿课题之一。通过对三元隧道中的泥岩进行了常规三轴压缩试验研究,分析了泥岩的强度、变形特性及其能量特性。低围压下泥岩的ε3~ε1关系曲线呈上凹型;高围压下,呈下凹型。并且泥岩试样的侧向变形对围压的敏感程度大于轴向变形。试样破坏应变能随着围压的增大而增加;实验机对试样所做的功大于试样破坏时实际吸收的能量,这主要因为试样侧向膨胀对液压油做功而持续释放能量,使得实验机对试样所做的功大部分用于对液压油做功。该研究对与泥岩相关岩土工程的设计和施工有一定的理论和借鉴作用。

Experimental Study on Mechanics Characteristics and Energy Properties of Mudstone

The soft rock has become one of most complex advanced topics in the field of geotechnical engineering because of the complexity of the composition and harmful effects on engineerings.Based on the triaxial test results under different confining pressures for Sanyuan tunnel,the strength,deformation and failure features,and energy properties of the mudstone are analyzed.The test results show that under low confining pressure,the ε3~ε1 relation curve of the mudstone would appear to be up-concave,and under high confining pressure,it would appear to be down-concave.The radial deformation of the mudstone sample on confining pressure is higher than its axial deformation.The failure strain energy of the sample increases linearly as confining pressure increases,the work done by the test machine in the mudstone is more than its energy absorbed actually when it failures,which is due to that the energy released continually by the radial deformation of the mudstone sample is mostly applied in the acting to the hydraulic oil.The study results have a certain reference to the design and construction of related geotechnical engineerings.